A68a, measuring 4,200-square-kilometres, is the world’s largest iceberg. It is roughly the size of Somerset. It had broken off from Antarctica’s Larsen C ice shelf in 2017 and has travelled 1,050 km in three years. Britain’s Royal Air Force has taken pictures of the iceberg moving towards the island territory of South Georgia. The iceberg is currently 130 miles off the island’s cost and could run aground in the shallow coastal waters.